﻿using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class DataList分页 : System.Web.UI.Page
{
  
   static string MyConnString = ConfigurationManager.AppSettings["SqlConn"];
    SqlConnection MyConn = new SqlConnection(MyConnString);     

    int PageSize, RecordCount, PageCount, CurrentPage;
    public void Page_Load(Object src, EventArgs e)
    {
        //设定PageSize
        PageSize = 2;

        //连接语句

        MyConn.Open();

        //第一次请求执行
        if (!Page.IsPostBack)
        {
            ListBind();
            CurrentPage = 0;
            ViewState["PageIndex"] = 0;

            //计算总共有多少记录
            RecordCount = CalculateRecord();
            lblRecordCount.Text = RecordCount.ToString();

            //计算总共有多少页
            PageCount = RecordCount / PageSize;
            lblPageCount.Text = PageCount.ToString();
            ViewState["PageCount"] = PageCount;
        }
    }
    //计算总共有多少条记录
    public int CalculateRecord()
    {

        int intCount;
        string strCount = "select count(*) as co from aa";
        SqlCommand MyComm = new SqlCommand(strCount, MyConn);
        SqlDataReader dr = MyComm.ExecuteReader();
        if (dr.Read())
        {
            intCount = Int32.Parse(dr["co"].ToString());
        }
        else
        {
            intCount = 0;
        }
        dr.Close();
        return intCount;
    }

    ICollection CreateSource()
    {

        int StartIndex;

        //设定导入的起终地址
        StartIndex = CurrentPage * PageSize;
        string strSel = "select * from aa";
        DataSet ds = new DataSet();

        SqlDataAdapter MyAdapter = new SqlDataAdapter(strSel, MyConn);
        MyAdapter.Fill(ds, StartIndex, PageSize, "内存名");
        return ds.Tables["内存名"].DefaultView;
    }
    public void ListBind()
    {
        score.DataSource = CreateSource();
        score.DataBind();

        lbnNextPage.Enabled = true;
        lbnPrevPage.Enabled = true;
        if (CurrentPage == (PageCount - 1)) lbnNextPage.Enabled = false;
        if (CurrentPage == 0) lbnPrevPage.Enabled = false;
        lblCurrentPage.Text = (CurrentPage + 1).ToString();

    }

    public void Page_OnClick(Object sender, CommandEventArgs e)
    {
        CurrentPage = (int)ViewState["PageIndex"];
        PageCount = (int)ViewState["PageCount"];

        string cmd = e.CommandName;
        //判断cmd，以判定翻页方向
        switch (cmd)
        {
            case "next":
                if (CurrentPage < (PageCount - 1)) CurrentPage++;
                break;
            case "prev":
                if (CurrentPage > 0) CurrentPage--;
                break;
        }

        ViewState["PageIndex"] = CurrentPage;

        ListBind();

    }
}
